Rotary disk drill



Dec. 6, 1927.

W. J. WILSON ET- AL ROTARY DTSK DRILL Filed Auz. 24, 1925 INVENTOR, WILLIAM JENNINGS EVILSOIV ALLA/VJ. C/IELTON A T TOR N E Y5 Patented lL'ec. d, i923.

YATES:

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WILLIAM JENNINGS WILSON, OF SOUTHGA'I'E, AND ALLAN J. CARLTON, F HUNTING- TON PARK, CALIFORNIA, ASSIGNORS TO U. S. TOOL COMPANY, OF: LONG BEACH, CALIFORNIA, A CORPORATION OF CALIFORNIA. 4

ROTARY DISK DRILL.

Application filed August 24, 1925. Serial No. 52,252.

Our invention relates to rotary disk drills as usedin well drilling.

A common fault of drills of this character is that frequently they fail to rotate about their own' aixeswhile being bodily rotated, thus causing one portionof their-"cutting edges to have constant engagement with the surface being drilled, in contradistinction to all portions of the cutting edges engaging 19 the surface being drilled, as intended. As a consequence, those portions of the cutting edges held in constant engagement with the surface being drilled become dulled and sometimes broken, and the drill thus fails to properly function.

It is a purpose of our invention to provide a rotary disk drill which eliminates the above recited objection by constructing the bits so that they Will have a feeding engagement'with the surface being drilled, thereby rendering the axial rotation of the bit-s positive, and thus insuring of all portions of their cutting edges having cutting engage meut with the surface being drilled.

We will describe only one form of rotary disk drill embodying our invention and will then point out the novel features thereof in claims. I Q

In the accompanying drawings,

Figure 1 is a view showing in side eleva' tion one form of rotary disk drill embodying our invention;

Figure 2 is a horizontal sectional view taken on the line 22 of Figure 1;

Figure 3 is an enlarged detail view showing in edge elevation one of the bits comprised in the drill shown in the preceding views.

Referring specifically to the drawings, in. which similar reference characters refer to similar parts, our invention, in its present embodiment, comprises a shaft or shank or bit body 15 adapted to be connected to suitable means for continuously rotating the driil as a unit in one direction, The lower end of the shank 15 is bifurcated to provide a pair ofarms or legs 16 which are bent so that their ends are odset with respect to a line intersecting the transverse axis of the shank. In the'free ends of these arms, stub axles or fine 17 are mounted, with one of their ends prov. ed with a flanged head 18 and the opposite" end threaded tov rcceire" a nut 19, the-two co operating tij {confine disk cutters 2O thereon. andinisuch-nianner asato permit free rotation of the c'u ters.

As illustrated td advantageiin Figure 3,

each cutter comprises acent'ral portion 20 Ofsubstantially conical form and relatively thick, and a marginal edge portion 20 which is corrugated in a circumferential direction with respect to the disk and a free edge of such portion is sharpened to provide a cutting edge 20. Because of the corrugated form of the marginal edge portion 20 it will be clear that the cutting edge 520 is u'n dulated, and it is by means of this undulated tive rotation of the cutter about its own axis so that all portions of the cutting edge.

are successively presented to the surface be ing drilled as the cutter is'bodil rotated. in this manner, the rotation of t e cutters about their own axes is insured at all times to cause their cut-tingedges to properly function and in a manner to prevent '1OCking against rotation, and the consequent disa advantages as previously pointed out.

It is thus seen that the present invention embodies a drilling bit having peripherally corrugated cutting disks rotatably rnounted on the body of the bitand that such disk cutters are mounted byv arms or'legs which are offset to advance the cutters and to rriaintain the cutters spaced apart. Moreover, the cutters are corrugated in their outer portion only andthe inner ends of the corrugations terminate at a point or such distance from the center thereof and with the surfaceof revolution generated by said region after the corrugated portion is worn away will contain the lower portion of the body entire ly within it. Moreover, such portion of the disk cutter-is Substantially increased in thickness over the thickness of thecorrugated portion of the cutter.

vThe disk bit of the present invention has the advantages that in certain formations it will have a more rapid drilling speed than the nor'mal'typesof disk bits. It also has the advantage that whenever the relatively thin corrugated portion of the 'cutter is worn away, the bit will then'substantially discontinue drilling. This will indicate to j the driller at the top of the well the worn state of the; cutters of the. bit before the drillinglis continuedfto such a point that the bit body will be substantially worn. By this means, the driller is prevented from drilling'an excessively small size well hole The disk cutters of, the present'invention are of thc'shearing type as distinguished from the types. of

' 7 spirit and scope of the appended claims crushers or-rollers,used upon ,certain drillingtbits intended for opera'tionjn forma-.

tions of exceptional hardness. i

Although we have herein shown and described only one form of rotary disk drill embodying our invention,. it is to be understood that various changes-andcrnodifications may be made therein without "departingfrom the spirit of the invention andthe We claim as our inventioni 1'. A rotary drill bit'comprising a body portion, a peripherally corrugated cutter isk rotatably mounted on the body, the, region of transition from the central non-f corrugated portion to the peripheral col-w rugated portion being much'fismallerthan the radius ofv the disk and occurring .at such a distance from the center thereof that the" surface of the revolution generated by said region after the corrugated portion is worn away will contain the lower body entirely within it.

2. A rotary drilling bit comprising a body, disk cutters mounted-on the-body and extending therebelow,'the disk cutters having corrugated cutting edges, the corrugaportion of the body when the a well.

tions extending inwardly for only a portion of the-width of the cutters, the inner ends of the corrugations terminating below the end of the body, the thickness of the cutters being increased atthe ends of the corru ations.

3. rotary drillingbit comprising a body and a rotary cutter -for1a drilling bit having a thickened" central portion 'surrounded by a corrugated portion terminating in a continuous corrugated cutting edge, the thickness of the cutter being substantially increased 'at the inner ends of the corrugations at a point below the lowest point of the'body when the bit is in cutting position in a wall. c

4. A rotary drilling bit comprising a body having a pair of offset legs extending below the body and twisted one in advance of the other, a ,disk cutter" separately mounted by each leg, the disk cutters being spaced apart, each "disk cutter having a thickened central portion surrounded by a peripherally corrugated portion terminating in a continuousc orrugated cuttin edgegthe thickness of the cutters being su stantially increased at the inner ends of the corruga tions at a point below the lowest pointjof therebelow and offset to position thelegsone in advance of the other, a single disk cutter carried by each leg on its inner side, the disk when the bit is in cutting pos'itio drilling comprising a cutters being spaced apart and in substantially vertical cplanes, each disk cutter hav- .1ng a thickene central portion surrounded by a corrugated portion terminating in a continuous corrugated cutting edge, the thickness of the cutter being substantially increased at the inner ends of the corrugations at a point below the lowest point of the ALLAN J. CARLTON. WILLIAM J. WILSON.

bit is in cutting position in 

